is one piece episode 588 filler?

Smoker lies motionless in the snow. With Law leaving with the heart he extracted.

The marines seize this chance to run towards Smoker. Luffy, Robin, Zoro and Usopp are riding on Brownbeard’s back when they spot the warship, speculating that the Marines are around.

Luffy calls out to someone Usopp saw in the distance, asking him if he remembers him and gives him his thanks.